Mophie ready to ship its thinnest external battery for the iPhone 3G, the Juice Pack Air. Doubling as both an external battery and hard-shell case, the device features a rechargeable 1200mAh lithium-polymer battery that is claimed to provide up to 270 additional standby hours, an extra 4.5 hours of talk and internet time, up to 20 hours of audio playback and roughly 6 hours of video playback. The
